Method of utilizing waste heat from gas



April- 20, 1926. 1,581,511

H. CLEMM ET AL METHOD OF UTI LIZING WASTE HEAT FROM GAS Filed April 5,1922 /n vent-bra Patented Apr. 20, 1926.

UNITED STATES PATENT OFFICE.

HANS'CLEMM, OF MANNHEIM-WALDHOF, AND ADOLF SCHNEIDER, OF KEHLHEIM,

V GERMANY, ASSIGNORS TO ZELLSTOFFFABRIK WALDHOF, OF MANNHEIM, WALD- HOF,GERMANY, A CORPORATION OF GERMANY.

METHOD OF UTILIZING WASTE HEAT FROM GAS.

Application filed April 3, 1922. Serial No. 549490.

To all whom itimay concern:

Be it known that we, HANS CLEMM and Anoiir SCHNEIDER, citizensof'Germany, residing, respectively, at Mannheim-lValdhof and Kehlheim,Germany, have invented certainnew and useful Improvements in Methods ofUtilizing VVa'ste Heat from Gas ,and we do herebydeclare the followingto be a full, clear, and exact description of the in vention, such aswill enable others skilled in the art to which it appertains to make anduse thesame. v

Our invention relates to improvements in methods of regeneratingwaste'heat of the gases coming out of sulphur-kilns, pyritekilns orother furnaces. There it is necessary to cool the gases which are comingfrom combustion and similar apparatuses, ordinarily cooling water issprinkled over the pipes or other heat exchang ng members of a coolingsystem traversed by the gas to be cooled, and the major part of the heattaken.

up by the water is wasted. In addition, means must be provided forcooling the heated water before it can be used again.

The object of the improvements is to provide a method of cooling gasesgenerated in sulphur-kilns or the like, by means of which the waste heatof these gases is regenerated. With this object in view, our inventionconsists in cooling the hot gases by means of fresh sulfit lye, andusing the said heated sulfit lye, if necessary after further heating thesame, for boiling the cellulose. In the practice of the invention, thecooling apparatus is traversed by the hot gases, such for example asgases from iron pyrite furnaces, and it is brought in contact with thefresh lye, such as sulfit lye, which is forced under pressure throughclosed cooling chambers provided in the apparatus. Thereby, any loss ornoxious change of sulphurous acid by heating the lye, is avoided. Theheated lye is directly supplied to the boiling apparatus filled withwood or it is first furthere within a. suitable apparatus.

For the purpose of explaining the method according to the invention, anexample embodying a device for exercising the same is shown in theaccompanying drawing, in which the same reference characters have beenused to indicate corresponding parts.

In the example shown in the drawing, a designates a sulphur-kiln orpyrite-kiln, the gases of which are forced under pressure throughcooling pipes 0, arranged in a lye pressure receptacle h by means of apump or ventilator I).

The gaseous S0 cooled in the cooling pipes c, is led through the pipe dinto the lye-tower e. In this tower, the S0 is converted into sulfitlye, which is pressed into the receptacle 'k by means of a pump 7. Forinstance, the lye may be introduced into the gas-steam-room of theclosed pressure receptacle h by means of an atomizer g or immediatelyinto the lye, contained in the receptacle.

Accordingly, the lye is heated in the receptacle h under pressure.Simultaneously, the hot SO coming out of the sulphur-kiln a isprofitably cooled. Till now, there was used water for this cooling ofthe hot S0 whereby a great loss of water and warmth was caused, which isavoided according to applicants invention. The hot lye which is underpressure may be pumped by means of a pump Z'through a pipe k and a pipem into the boiler n. The pipe 21 serves for leading olfthe condensingproducts.

What we claim is:

The herein-described method of regenerating the waste heat of the gasescoming out of sulphur-kilns, pyrite-kilns or other furnaces, whichconsists in transmitting the heat from the said gases to fresh sulfitlye in a heat-exchanging device through which the lye is forced underpressure, and then conveying said lye into an apparatus for boilingcellulose, all the system containing fresh lye heated or not beingcompletely closed, thus retaining a certain pressure therein foravoiding any loss of S0 and any noxious change of the lye by heating it.

In testimony whereof we hereunto vafiix our signatures.

DR. HANS CLEMM. DR. ADOLF SCHNEIDER.

